Würzburg 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 69: Experimentelle Methoden der Astroteilchenphysik III
T 69.9: Vortrag
Mittwoch, 21. März 2018, 18:30–18:45, Z6 - SR 2.013
Silicon Photomultipliers (SiPM) in a Liquid Xenon Time Projection Chamber (TPC) — •Christopher Hils1, Matteo Alfonsi1, Andrea Brogna2, Daniel Wenz1, and Uwe Oberlack1,2 — 1Johannes Gutenberg-Universität Mainz — 2PRISMA Detektor Labor, Johannes Gutenberg-Universität Mainz
Liquid Xenon Time Projection Chambers (LXeTPC) are used in rare event searches for Dark Matter or neutrinoless double beta decay, or in applications as Compton telescope or camera, where the noble medium offers a combination of scintillation light and ionization that can be used to build large, uniform 3D position sensitive detectors. SiPMs are compact solid state light sensors with single photon count capabilities superior to the commonly used photomultiplier tubes (PMTs). Additionally they provide a high granularity, require comparatively low bias voltage, require less volume and induce less mass into the TPC due to their compact dimensions and, potentially, have a smaller cost per area. Most commercially available SiPMs are not sensitive to the scintillation light of xenon in the VUV regime at 178nm, so a special treatment is neccesary, in which the inactive entrance layer on top of the SiPM is thinned. We operate a test stand to observe the operational stability and to measure the sensitivity, crosstalk and afterpulse properties of three VUV-sensitive SiPM samples in liquid xenon. A 1" PMT is operated simultaneously for reference while scintillation light is provided by a 241Am source immersed in liquid xenon.